wmdrumaizi wrote:1)Is it possible to upload to 'picture' column where 'id' column is already occupied?
Yes. Use MySQL's UPDATE statement.
wmdrumaizi wrote:2)Do I have to create another table to store the picture separately...
No, you don't, unless you want each user to be able to upload multiple pictures.
As a side note, it's generally discouraged to use MySQL for file storage, especially if you anticipate having many concurrent connections. Simply saving them as files in the filesystem tends to be more efficient. In this case, you'd just give each picture a unique filename and store the filename in the database.